You are not allowed to create folders with following names in windows:
CON, PRN, AUX, CLOCK$, NUL, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9,
LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, and LPT9.
we cannot create folder with these names as
Name Function
--------------------------------
CON Keyboard and display
PRN System list device, usually a parallel port
AUX Auxiliary device, usually a serial port
CLOCK$ System real-time clock
NUL Bit-bucket device
A:-Z: Drive letters
COM1 First serial communications port
COM2 Second serial communications port
COM3 Third serial communications port
COM4 Fourth serial communications port
LPT1 First parallel printer port
LPT2 Second parallel printer port
LPT3 Third parallel printer port these are reserved
Note: Infact if u create a notepad file and give it name as "con" it will give u msg box...try it now.